@sgunhouse Hello! I have the same issue, what the OP describes as 'works fatal' means that you can't scroll up or down, and clicking on the 'full screen mode' makes the entire page bigger. Also, the link of the video clicked changes after a few seconds to 'www.youtube.com'.
The problem starts whenever a video is opened in a new tab, the issue could be reproduced by adding an ad-blocker extension such as AdBlock Plus or uBlock Origin (which is the one I had and asumed was the culprit, but after disabling it, uninstalling, reinstalling, uninstalling again and restoring the browser several times, the problem was still there).
@eleazarsc19 You never say what exactly happens. I'll presume "works fatal" means crashes Opera (though that isn't really clear), but you don't say when it crashes - how to reproduce the issue.
This is how my browser looks as well, the video is merged with YouTube's frontpage: